[Sync] Add histograms for cookie jar state on Sessions commit

sync/internal_api/test/fake_sync_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sync/internal_api/public/test/fake_sync_manager.h"
 
 #include <cstddef>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 251 matching lines @@
 }
 
 void FakeSyncManager::SetInvalidatorEnabled(bool invalidator_enabled) {
   // Do nothing.
 }
 
 void FakeSyncManager::ClearServerData(const ClearServerDataCallback& callback) {
   callback.Run();
 }
 
-void FakeSyncManager::OnCookieJarChanged(bool account_mismatch) {}
+void FakeSyncManager::OnCookieJarChanged(bool account_mismatch,
+                                         bool empty_jar) {}
 
 }  // namespace syncer